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wgus46 ksew 162329

bulletin - immediate broadcast requested
flood warning
national weather service seattle wa
429 pm pdt wed apr 16 2014

flood bulletin no. 30

429 pm pdt wed apr 16 2014

the national weather service in seattle has extended the

* flood warning for the north fork stillaguamish river east of the
  state route 530 slide in north central snohomish county...

* until 445 pm pdt thursday.

* flooding continues on the north fork of the stillaguamish river 
  upstream of the sr 530 slide due to debris from the state route 
  530 slide partially blocking the river and the resulting pooling 
  of water behind the  debris dam. we will be updating the flood 
  warning on a day to day basis.

* the oso area has received 0.81 inches of rain in the last 24
  hours. the rainfall forecast is for 1.5 inches of rain in the oso 
  area and up to 2.5 inches in the mountains. the river is rising 
  now and will rise sharply thursday...cresting thursday night 
  before midnight with the largest flows since the slide occurred. 
  the peak flow forecast for the north fork river near arlington 
  gage is near 8.8 ft. and 11400 cfs and near 7300 cfs for the north 
  fork stillaguamish river at oso.

* at 320 pm pdt...the pool elevation was 284.9 ft.

* the pool elevation is forecast to rise to 285.3 ft. by 500 am 
  thursday then rise sharply to 287.6 ft. by thursday night before 
  midnight. the pool elevation will start dropping significantly 
  friday. there is a great amount of uncertainty in the forecast 
  pool elevation crest due in part to limited knowledge of how much 
  water the new stream channel through the slide debris will be able 
  to convey.

for the latest river stages and forecasts...visit (all lower case) or... and go to the rivers and lakes section.

precautionary/preparedness actions...

a flood warning means flooding is occurring or imminent. most flood
related deaths occur in automobiles. do not attempt to cross water
covered bridges...dips...or low water crossings. never try to cross a
flowing stream...even a small one...on foot. to escape rising water
move up to higher ground.


lat...lon 4825 12181 4829 12185 4829 12177 4829 12166
      4824 12165 4826 12174


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